names = {'东邪' : '黄药师', '西毒' : '欧阳锋', '北丐' : '洪七公'}
# print(names.pop('西毒'))
print(names)

names['西毒'] = '杨过'
print(names)
names['西狂'] = names.pop('西毒')
print('毒->狂：', names)


for i in names:
    print(i, ": ", names[i])
